Check on the lift pump, Hope it has an aftermarket fass style system, the stock lift pumps are garbage. Also check on the injector pump, if it hasn't been replaced it will more then likely need to be pretty soon.

When you go to look at it cycle the key 3 times and it will read the codes stored in the ecu, The codes will come up on the odo screen. If it has any codes pertaining to the injection pump you should ask less money, Thats a couple thousand bucks to have that replaced.